Well, looks like it's probably the original cluster. Like someone on the earlycj5 site stated, the CJ3B's had the "tub lines".
Had to ask what they were, but they're evident on mine.
it's 4 3/4" piece added between the kick panel and the cowl area so the cowl is the same heigth as the hood.
So the line that runs parallel to the ground across the side of the hood, extends past the hood to the dash along the cowl. If you look at mine, you'll see it.
Getting closer to confirming it is an early 50's CJ3B with an original dash.